I'm impressed with the way you've drawn the sprites. Especially the TV at the very beginning. One thing I have to say the needs improvement is the overworld walking/standing cycle. Obviously there's issues rendering both parts seamlessly (I definitely had this issue as well). And coloring is pretty solid for the most part, though some parts show a bit of color seems where one 8x8 block is obviously that color over another (if you seen a zx spectrum game, it makes more sense on the color part). Otherwise its amazing regardless.